C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/61
C22C 9/01 (2006.01)
Patent
CA 1091476
ABSTRACT OF THE DISCLOSURE A copper base alloy of superior tarnish resist- ance consisting essentially of 7.0 to 8.5% aluminum by weight and 1.5 to 2.5% nickel by weight with the balance (89-91.5 wt %) being essentially copper. The process by which the alloy is prepared is controlled so that the alloy is primarily single phased, i.e., a face centered cubic alpha phase solid solution containing a fine dispersion of nickel aluminide compound (NiAl) and less than 2 volume percent of the brittle inter- metallic phases known as beta and gamma. By composition control and by producing an essentially single phased microstructure, the alloys of the invention are capable of forming a stable oxide film having high tarnish resist- ance. The alloy, upon prolonged exposure indoors to ambient air and frequent handling, develops a very thin, tight, uniform oxide film which, although visible, is still attractive and does not mask the basic warm tone of the base metal. This film, when intact, serves to protect the underlying metal from further oxidation, and when damaged, is self-healing and re-established itself to provide a uniform protective and decorative film.
274121
Kennecott Copper Corporation
Kirby Eades Gale Baker
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